Differing amount of fizz could be to do with different seals on your bottles. When we did our first batch we used some Ikea bottles that we'd been using for wine for years. A couple of them were great but I think 3 had no fizz at all, the seals on the bottles were shot.
The sediment should drop to the bottom if you've got a good seal on the bottle. Give it a week in the bottle without releasing pressure and it should be good to try. I highly recommend keeping it in the fridge for several days (after it's had a week at room temp to build up fizz), or 20-30mins in the freezer prior to opening. If you're using flip top bottles keep your hand just over the cap when you release it, otherwise your flip top might fly across the room, it also allows you to close it again quickly if too explosive!
If you haven't chilled it enough it will be very volcanic when you open it and that will raise the sediment making it cloudier, not the end of the world but better if the sediment stays at the bottom.
Good luck!
Dans